// For flags

CVE-2025-5372

Libssh: incorrect return code handling in ssh_kdf() in libssh

Severity Score

5.0
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values where OpenSSL uses 0 to indicate failure and libssh uses 0 for success—the function may mistakenly return a success status even when key derivation fails. This results in uninitialized cryptographic key buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality, integrity, and availability.

Se encontró una falla en las versiones de libssh compiladas con versiones de OpenSSL anteriores a la 3.0, específicamente en la función ssh_kdf(), responsable de la derivación de claves. Debido a la interpretación inconsistente de los valores de retorno, donde OpenSSL usa 0 para indicar un fallo y libssh usa 0 para éxito, la función puede devolver erróneamente un estado de éxito incluso cuando la derivación de claves falla. Esto provoca que se utilicen búferes de claves criptográficas sin inicializar en comunicaciones posteriores, lo que podría comprometer la confidencialidad, integridad y disponibilidad de las sesiones SSH.

Ronald Crane discovered that libssh incorrectly handled certain base64 conversions. An attacker could use this issue to cause libssh to crash, resulting in a denial of service, or possibly execute arbitrary code. Ronald Crane discovered that libssh incorrectly handled the privatekey_from_file function. An attacker could use this issue to cause libssh to crash, resulting in a denial of service, or possibly execute arbitrary code.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low
Attack Vector
Network
Attack Complexity
High
Authentication
Single
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2025-05-30 CVE Reserved
  • 2025-07-04 CVE Published
  • 2025-07-08 CVE Updated
  • 2025-07-10 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-682: Incorrect Calculation
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Red Hat
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Enterprise Linux
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*-
Affected
Redhat
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Openshift
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*-
Affected
Opensuse
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Leap
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*-
Affected
Redhat
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Enterprise Linux
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*-
Affected
Slackware
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Slackware Linux
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Affected
Suse
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Sle-module-basesystem
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*-
Affected
Suse
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Sle Hpc
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Affected
Suse
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Sled
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Affected
Suse
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Sles
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Affected
Suse
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Sles Sap
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*-
Affected